{"uid":"cap_O-jhBlbpPJANdRNlPHgal","slug":"pyfile-toolkit-ethereum-function-signature-lookup-41daf6fd","name":"Pyfile Toolkit – Ethereum Function Signature Lookup","description":"Ethereum function signature lookup. ?selector=0xa9059cbb","url":"https://pyfile-agent.taile3ff35.ts.net/data/abi","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{"selector":{"type":"string"}}}}},"output":{"type":"object"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_LYItgEJJNZyf6ZwtMDV5I","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Resolves a 4-byte Ethereum function selector (e.g. 0xa9059cbb) to its human-readable ABI function signature","exampleAgentPrompt":"What Ethereum function signature corresponds to the selector 0xa9059cbb? Look it up in the ABI database.","exampleUseCases":[{"title":"Decode unknown smart contract calldata","prompt":"I'm analyzing a transaction and the calldata starts with 0xa9059cbb — what Solidity function does that selector map to?"},{"title":"Audit smart contract interactions","prompt":"I found this 4-byte selector 0x23b872dd in a suspicious transaction. Can you tell me what Ethereum function it calls?"},{"title":"Build readable transaction explorer","prompt":"For the selector 0x095ea7b3, what's the human-readable ABI function signature so I can display it properly in my transaction viewer?"}],"resultDescription":"The endpoint returns the human-readable Ethereum function signature (e.g. 'transfer(address,uint256)') corresponding to the provided 4-byte selector, enabling decoding of raw EVM calldata.","failureModes":["Unknown selector not found in the signature database — returns empty or not-found response","Malformed selector (not a valid 4-byte hex string) causes an error","Network unavailability of the Tailscale-hosted endpoint","Selector has multiple possible matches (hash collision) — may return one or all"],"whenToPreferThis":"Use this endpoint when you need to resolve a raw 4-byte Ethereum function selector to its ABI signature for calldata decoding, transaction analysis, or smart contract auditing. Prefer this over generic blockchain explorers when you need a lightweight, programmatic lookup without full node access.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T06:42:11.843Z","isFirstParty":false}